As the name suggests, Trench Type Soakaways are
basically rectangular trenches filled with granular
material (40mm - 60mm, void ratio of 0.3) and surrounded
with a geotextile membrane. Often a cheaper alternative
to the concrete ring type soakaway, they are also
more commonly used for larger impermeable areas.
In trench soakaways, the movement of
suspended and floating material into the distributor
pipe can be minimised by using wet wells which act
as a silt trap to catch solids before entering the
granular material and, thus, choking the soakaway
and reducing its effectiveness. Such wet wells will
require periodic maintenance where the silt and debris
rises to the level of the outgoing pipe.
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Visual Soakaway Design - Help
